Typescript Models: Interfaces vs Model Classes

models.ts

/**
 *  advantages:
 *  - interface code not compiled
 *  - faster at runtime (Javascript object only; no prototypes)
 */
interface IServiceCall {
  id: string | number;
  title: string;
  businessPartner: string;
  startTime: date;
  endtime?: date;
}

const sc1: IServiceCall = {
  id: '12312qsasdad',
  title: 'Repair Rotor ESX2000',
  businessPartner: 'Nestle SA',
  startTime: new Date()
};

/**
 *  advantages:
 *  - define default values
 */
class ServiceCallModel {
  constructor(public id: string | number,
              public title: string,
              public businessPartner: string,
              public startTime: date = new Date(),
              public endTime?: date) {}
}

const sc2: ServiceCallModel = new ServiceCallModel('12312qsasdad',
                                                   'Repair Rotor ESX2000',
                                                   'Nestle SA',
                                                   new Date());

• use interface to create models
• interface names are CapitalCamelCase and start with the letter I indicating it being an interface
• if default values are needed during creation, then use factory method pattern